It's just up to the individual breeder as to what they use.
I've adopted the Condro ID convention, but altered it slightly to denote the clutch number...Here's one for an example.
AC.2004.5.M3.Msm
The first initials (AC) stand for the breeder's first and last initials (Anthony Caponetto)
The first numbers are for the year (2004)
The next number (5) is clutch number for the year (clutch 5)
The next alphanumeric set (M3) stands for the sex and what number from the clutch (Male 3)
The last set of initials (Msm in this case) stand for Morelia spilota mcdowelli.
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Anthony Caponetto
